Lithium-ion batteries are easy to explode in high temperature and high pressure environments; lithium polymer batteries has a aluminum plastic film as the outer casing, no battery leakage problem, and the battery contain the colloidal solid instead of liquid electrolyte inside,so even if the liquid is very hot, it would not explode.
I seen my $1000 AK74U airsoft gun blow because of a turnigy nano-tech 7.4v (2 cell) lipo. Was holding and firing it when it happened. An airsoft BB (6mm ball of plastic) that was shot at me happened to slip right between the handguards (which was about an 8mm tall and maybe 5-6 inch long slot) and barely clipped my battery and the sound and the flash was enough to disorient me. Blew the handguards and upper receiver off (which is where the battery is located) and cracked the front of the lower receiver and cracked the gearbox. Both receivers on that model are full metal, as well as the gearbox shell, and the hanguards were wood on a metal frame. It wasn't a cheap plastic Walmart model. Afterwards, the gun wasn't even salvageable. I walked away with minor burns and a solid bruise on a rib from one of the handguards.
Don't fool yourself, those batteries hold an impressive amount of energy, and can release it all at once unexpectedly. But obviously you can believe whatever you want, it won't effect me either way.
I'll also add, I am not saying don't use it. I'm not saying vaping the way you do is wrong or anything (even though I wouldn't vape that way) and fully support your ability to do as you see fit. I just wanted to stress the fact that they can fail in just as catastrophic ways as pretty much any other battery retaining that amount of power. More so if you use some of those monster lipos like I use in my DSG.
